scholarly journals Programmed Cell Death in the Leaves of the Arabidopsis Spontaneous Necrotic Spots (sns-D) Mutant Correlates with Increased Expression of the Eukaryotic Translation Initiation Factor eIF4B2

2011 ◽  
Vol 2 ◽  
Author(s):  
Gwénaël M. D. J.-M. Gaussand ◽  
Qi Jia ◽  
Eric van der Graaff ◽  
Gerda E. M. Lamers ◽  
Paul F. Fransz ◽  
...  
Keyword(s):  
Cell Death ◽  
Programmed Cell Death ◽  
Translation Initiation ◽  
Translation Initiation Factor ◽  
Initiation Factor ◽  
Eukaryotic Translation Initiation Factor ◽  
Eukaryotic Translation ◽  
Eukaryotic Translation Initiation ◽  
Necrotic Spots

scholarly journals DAP-5, a novel homolog of eukaryotic translation initiation factor 4G isolated as a putative modulator of gamma interferon-induced programmed cell death.

1997 ◽  
Vol 17 (3) ◽  
pp. 1615-1625 ◽  
Author(s):  
N Levy-Strumpf ◽  
L P Deiss ◽  
H Berissi ◽  
A Kimchi
Keyword(s):  
Cell Death ◽  
Programmed Cell Death ◽  
Translation Initiation ◽  
Hela Cells ◽  
Translation Initiation Factor ◽  
Initiation Factor ◽  
Terminal Part ◽  
Ifn Gamma ◽  
Eukaryotic Translation ◽  
Eukaryotic Translation Initiation

A functional approach to gene cloning was applied to HeLa cells in an attempt to isolate cDNA fragments which convey resistance to gamma interferon (IFN-gamma)-induced programmed cell death. One of the rescued cDNAs, described in this work, was a fragment of a novel gene, named DAP-5. Analysis of a DAP-5 full-length cDNA clone revealed that it codes for a 97-kDa protein that is highly homologous to eukaryotic translation initiation factor 4G (eIF4G, also known as p220). According to its deduced amino acid sequence, this novel protein lacks the N-terminal region of eIF4G responsible for association with the cap binding protein eIF4E. The N-terminal part of DAP-5 has 39% identity and 63% similarity to the central region of mammalian p220. Its C-terminal part is less homologous to the corresponding region of p220, suggesting that it may possess unique functional properties. The rescued DAP-5 cDNA fragment which conveyed resistance to IFN-gamma-induced cell death was expressed from the vector in the sense orientation. Intriguingly, it comprised part of the coding region which corresponds to the less conserved C-terminal part of DAP-5 and directed the synthesis of a 28-kDa miniprotein. The miniprotein exerted a dual effect on HeLa cells. Low levels of expression protected the cells from IFN-gamma-induced programmed cell death, while high levels of expression were not compatible with continuous cell growth. The relevance of DAP-5 protein to possible changes in a cell's translational machinery during programmed cell death and growth arrest is discussed.

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